CN104870784A - Natural gas engine and operation method for natural gas engine - Google Patents
Natural gas engine and operation method for natural gas engine Download PDFInfo
- Publication number
- CN104870784A CN104870784A CN201380061749.0A CN201380061749A CN104870784A CN 104870784 A CN104870784 A CN 104870784A CN 201380061749 A CN201380061749 A CN 201380061749A CN 104870784 A CN104870784 A CN 104870784A
- Authority
- CN
- China
- Prior art keywords
- fuel
- gas
- natural gas
- light oil
- cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
- F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
- F02D19/10—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels peculiar to compression-ignition engines in which the main fuel is gaseous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
- F02B3/08—Methods of operating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
- F02D19/10—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels peculiar to compression-ignition engines in which the main fuel is gaseous
- F02D19/105—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels peculiar to compression-ignition engines in which the main fuel is gaseous operating in a special mode, e.g. in a liquid fuel only mode for starting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
- F02D41/0057—Specific combustion modes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/006—Controlling exhaust gas recirculation [EGR] using internal EGR
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/01—Internal exhaust gas recirculation, i.e. wherein the residual exhaust gases are trapped in the cylinder or pushed back from the intake or the exhaust manifold into the combustion chamber without the use of additional passages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
- F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
- F02B2043/103—Natural gas, e.g. methane or LNG used as a fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0242—Variable control of the exhaust valves only
- F02D13/0246—Variable control of the exhaust valves only changing valve lift or valve lift and timing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0273—Multiple actuations of a valve within an engine cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/001—Controlling intake air for engines with variable valve actuation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
Provided is a natural gas engine (10) in which natural gas fuel (C) is injected into an intake system path (12), diesel fuel (f) serving as an ignition source is injected into a cylinder, and when igniting the natural gas fuel (C), the natural gas fuel (C) is combusted by compression ignition of the diesel fuel (f) that has been injected into the cylinder without the use of a spark ignition system. The natural gas engine (10) is equipped with an exhaust gas introduction mechanism that introduces exhaust gas (G) into a cylinder during an intake stroke. As a result, natural gas fuel is ignited in a reliable and stable manner and highly efficient combustion is performed using a small amount of fuel and a small amount of intake air even during a low load operation state, stoichiometric combustion, or rich combustion in an engine that is provided with a natural gas fuel injection device that injects diesel fuel serving as an ignition source into a combustion chamber and injects natural gas fuel into an intake system path.
Description
Technical field
The present invention relates to the method for operation of natural gas engine and natural gas engine, in natural gas engine, have and do not use spark ignition system and efficient combustion system gas fuel being burnt by the compression ignition in the self-ignition fuel sources such as light oil.
Background technique
As shown in Figure 5, natural gas engine (CNG motor) 10X of prior art is, by making the gas fuel C compressed by piston 63 catch fire based on the spark ignition of the spark plug 62 being arranged at cylinder head 61, and this gas fuel C is burnt.
This gas fuel C is, by the gas fuel sparger (gas fuel injection apparatus) 35 arranged on the gas handling system path 65 be communicated with the firing chamber 64 formed between cylinder head 61 and the top of piston 63, spray in suction air A, and in the intake stroke of suction valve 66 valve opening, be inhaled into firing chamber 64 together with this suction air A.This gas fuel C catches fire by being configured at the electrical spark of the spark plug 62 of the central upper of firing chamber 64, although be conceptual view, burns like that as visible from the thin line in layeredly expanding.Then, pushing piston 63 in the expansion stroke of the expansion along with the combustion gas produced by this burning and doing work, discharges combustion gas (waste gas) G towards vent systems path 67 in the exhaust stroke of ensuing outlet valve 68 valve opening.
And, situation at the less mini engine of the diameter of low output, cylinder barrel (cylinder-bore), the phase by the more state of oxygen and gas fuel C hold incendive motor, in this layer combustion, gas fuel C burns towards the mode of firing chamber 64 integral extension with the approximate centre from firing chamber 64, therefore the power homogenization of pushing piston 63, pushing force Fp as a whole towards the central axis direction of piston 63, piston 63 to-and-fro motion swimmingly.
But, when the big-block engine that the diameter of height output, cylinder barrel is larger, the combustion gas G of high temperature flows out towards vent systems path 67 side of motor 10X, on the other hand, towards the suction air A of gas handling system path 65 side inflow low temperature, therefore uprise relative to the temperature of gas handling system path 65 side, vent systems path 67 side, especially, the part H represented by crosshatch in Fig. 6 easily becomes high temperature.Therefore, generation is referred to as the phenomenon of detonation (abnormal combustion), that is: gas fuel C not based on spark plug 62 igniting and catch fire, but contacted with this high-temperature portion H before entering combustion stroke and catch fire, the integral extension of burning from high-temperature portion H side towards firing chamber 64.When producing this phenomenon, burn from the side, a corner of firing chamber 64 towards integral extension, therefore the power of pushing piston 63 becomes uneven, pushing force Fp as a whole becomes the direction of inclination relative to the central axis direction of piston 63, piston 63 and cylinder 70 one-side contact and become cannot to-and-fro motion swimmingly, become the reason of engine failure.In addition, this detonation is also one of reason of pinking.
In addition, when reprocessing be carried out to waste gas at the NOx in order to reduce in waste gas by three-way catalyst, the emission-control equipment being carried with three-way catalyst is arranged at exhaust passageway reduction purification is carried out to the NOx in waste gas.This three-way catalyst catalyst performance under the air-fuel ratio state that oxygen is more reduces, and is therefore preferably the dense state of air fuel ratio that oxygen concentration in waste gas is lower.Therefore, burn with Theoretical combustion (burning according to theoretic mixture ratio: after burning, oxygen becomes the perfect combustion of zero), dense burning (burning that the oxygen concentration close to theoretic mixture ratio is lower) in cylinder., by the intake-air throttle valve being arranged at inlet air pathway, the suction air quantity sucked in cylinder is controlled for this reason, become and make required for gas fuel burning and sufficient oxygen and supply suction air, in cylinder, carry out Theoretical combustion.
Even if when this Theoretical combustion or dense burning, suck the mixed gas also easy burning unlike phase of air A and gas fuel C, therefore can take fire from the high-temperature portion H of vent systems path 67 side, become and easily produce detonation.
As mentioned above, when considering the high output of natural gas engine, maximization, dense burning, needing the problem solving detonation, in addition, also needing the spark plug solved in plug ignition mode to damage the problem of this spark plug fire damage because of heat.In addition, when the spark plug of spark ignition is a position, ignition source is less and be difficult to each circulation is reliably caught fire, and therefore there is the poor this problem of combustion efficiency.When combustion efficiency is poor, need a large amount of fuel to obtain required motor output, the heat produced also increases.As a result, there are the following problems: the problem of the various durability such as damage, the breakage of exhaust system component that caused by heat of the electrode part of spark plug easily produce specific fuel consumption, being caused by heat.
As the countermeasure for this problem, such as, described in the JP 2012-57471 publication of Japanese publication, the fuel control unit having a kind of internal-combustion engine is proposed, CNG (rock gas) fuel is sprayed towards inlet air pathway by CNG sparger (CNG fuel injection system), light oil is sprayed towards firing chamber by light oil sparger (light oil fuel injection apparatus), mixed by the light oil higher with compression ignition and as kindling material, CNG burnt in light oil, and changing the ratio of CNG and light oil according to pressure maximum during burning in firing chamber.
As shown in Figure 7, also using in this natural gas engine 10Y of light oil fuel, in the compression stroke that the mixed gas mixed gas fuel C and suction air A compresses, light oil fuel f is sprayed by light oil fuel sparger (light oil fuel injection apparatus) 69, this light oil fuel f spreads in firing chamber 64, and by the adiabatic compression of mixed gas, the temperature of mixed gas rises, when exceeding ignition (catching fire) temperature of light oil, by compression ignition, light oil fuel f takes fire, and the gas fuel C around this kindling material also burns.At this combustion start time, light oil fuel f spreads in firing chamber 64, therefore becomes multiple spot and catches fire and can prevent catching fire from vent systems high-temperature portion, burns in the entirety of firing chamber 64, applies roughly uniform power to the top of piston 63.Therefore, the pushing force Fp of pushing piston 63 roughly becomes the central axis direction of piston 63, piston 63 to-and-fro motion swimmingly.Thus, in this motor using light oil fuel and gas fuel, detonation can be prevented.In addition, owing to not using spark plug, so the fire damage of spark plug also can not be produced.
But, also using in this natural gas engine of light oil fuel, as shown in Figure 8, with prior art be compared with 2 ~ 8 diesel engine of carrying out operating with air excess coefficient lambda, be in the natural gas engine of the Theoretical combustion of 1 in air excess coefficient lambda, suck air quantity significantly to reduce, the compression pressure therefore also existed in cylinder reduces, and is risen also reduce this problem by the temperature of the mixed gas in the cylinder of adiabatic compression.Especially, when the underload operation range that motor output (horsepower) is less, when the minimizing with fuel accompany, in order to maintain Theoretical combustion reduce suck air quantity time, the reduction that there is the compression pressure in cylinder comparatively significantly and burning becomes unstable this problem, needs to solve this problem.
Related to this, described in the JP 2002-349241 publication of Japanese publication, the present inventor proposes there is a kind of diesel engine, in the diesel engine possessing the Exhaust gas purifying device of PM reliably for the purpose of continuous burning making DPF trap in the wider operation range in diesel engine, exhaust cam is formed as possess two sections that exhaust imports cam, or exhaust is set and imports valve, and the exhaust introducing mechanism being used for importing waste gas in intake stroke in cylinder is set, when delivery temperature region is low-temperature region, make air inlet shutter, exhaust throttle and the work of exhaust introducing mechanism, and make delivery temperature (temperature in cylinder) increase.
This diesel engine is only using the motor of light oil as fuel, but be also following motor: be used in the suction stroke of motor and a part for the waste gas of exhaust passageway refluxed in cylinder and the exhaust introducing mechanism making internal cylinder temperature increase, even if make suction air quantity reduce by intake-air throttle valve under the operating condition of motor is light-load state, the motor caught fire with also can making the fuel stabilization in cylinder.
Prior art document
Patent documentation
Patent documentation 1: the JP 2012-57471 publication of Japanese publication
Patent documentation 2: the JP 2002-349241 publication of Japanese publication
Summary of the invention
The problem that invention will solve
The present inventor, in view of above-mentioned condition, obtains following opinion and expects the present invention, that is: by the exhaust introducing mechanism being used for importing in cylinder waste gas in intake stroke is assembled into natural gas engine, can solve the problem points of above-mentioned natural gas engine thus.
The object of the present invention is to provide the method for operation of natural gas engine and natural gas engine, the light oil fuel of ignition source is sprayed in firing chamber, in the motor of gas fuel injection apparatus that gas fuel is sprayed towards gas handling system path possessing, even if in low load operating state, Theoretical combustion or dense burning, also can reliably and stably gas fuel be caught fire, high efficiency burning can be carried out by less fuel and less suction air.
For solving the means of problem
Natural gas engine of the present invention for realizing object as described above is configured to, gas fuel is sprayed towards gas handling system path, by the light oil fuel of ignition source towards in-cylinder injection, spark ignition system is not used when the catching fire of gas fuel, and by the compression ignition being injected into the light oil fuel in cylinder, gas fuel being burnt, this natural gas engine possesses the exhaust introducing mechanism importing waste gas in the cylinder in intake stroke.
In addition, this exhaust introducing mechanism can adopt the following that formation having become known technology.The formation of one of them is, in the exhaust cam making exhaust valve operation, for in common exhaust stroke by the common cam profile of outlet valve valve opening, the exhaust that additional formation has the phase angle of roughly 90 ° imports cam profile, and enable this exhaust importing cam profile carry out work according to the operating condition of motor, in intake stroke, exhaust valve lift 1mm ~ 3mm degree is made its valve opening thus, make in cylinder thus and vent systems communication, in intake stroke, import waste gas.
Another is configured to, be arranged through the exhaust importing valve that the o different from outlet valve carries out the work of open and close valve, operating condition according to motor gives drive singal to this o, makes exhaust import valve thus and promote and make its valve opening in intake stroke.Thus, make in cylinder and vent systems communication, in intake stroke, import waste gas.
In addition, in the present invention, without the need to being defined in above-mentioned two formations, even if formation in addition, as long as have the formation of the function importing waste gas in the cylinder in intake stroke.
According to this formation, by being vented the work of introducing mechanism, the high-temp waste gas of vent systems path can be made thus in intake stroke suitably to reflux in cylinder, and after burning is tight, the waste gas of high temperature is imported in cylinder, therefore, it is possible to make the temperature of the mixed gas of light oil fuel, gas fuel, suction air and the waste gas in cylinder rise.In this exhaust imports, owing to importing the waste gas of high temperature after burning is tight, thus with via possess cooler for recycled exhaust gas EGR passage and import the EGR gas of temperature step-down situation compared with, internal cylinder temperature rising Be very effective becomes large.
As a result, just stably can carry out compression and combustion by a small amount of light oil fuel, the burning of this light oil fuel stably can also be carried out the burning of gas fuel as ignition source.Thus, can realize the burning that combustion efficiency is good and stable, in addition, can reduce the amount for the light oil fuel caught fire, therefore the consumption of light oil fuel is a small amount of.In addition, as a whole, the heat produced due to the burning of fuel tails off, and the heat therefore towards vent systems flow channels reduces, and the fire damage caused by this heat reduces, and therefore the durability of the exhaust system component of motor improves.
In addition, by being vented the work of introducing mechanism, even if internal cylinder temperature also can be made promptly to heat up when motor becomes the starting of low temperature, therefore startability becomes good.And, even if start time also can be started by a small amount of light oil, therefore by start cause misfire and the discharge capacity of unburned hydrocarbon (not firing HC) also significantly reduces.Further, internal cylinder temperature can be made promptly to heat up, therefore, it is possible to accelerate smoothly.
In addition, by utilizing the exhaust introducing mechanism making the temperature in cylinder improve, even if under underload operating condition, also the temperature in cylinder can be maintained the easily ignitable temperature of light oil, stable catching fire can be measured by less light oil, flameholding can be made, therefore, it is possible to reduce engine luggine and improve riding comfort (manoeuvring performance) by a small amount of fuel.In addition, the exhausted air quantity of light-load state can be reduced.
Therefore, when have employed bypass is set on exhaust passageway and the waste gas cleaning system of the DPF compared with small capacity of light-load state is set, the capacity of the DPF being arranged at bypass can be reduced and carry out miniaturization, therefore, it is possible at higher this small-sized DPF of partial configuration of the temperature closer to engine main body, being measured by the light oil PM produced that burns in the waste gas discharged in air can be reduced.In addition, in the formation of this exhaust treatment system, under the high capacity operating condition that delivery temperature is higher, control for not by bypass by the DPF that the capacity of the back segment being arranged at exhaust passageway is larger, therefore exhaust resistance is less and purify coal smoke by DPF.
Be configured in above-mentioned natural gas engine, the amount of the light oil fuel towards in-cylinder injection is set to the light oil fuel amount of idle running in whole operation range of motor, the increase and decrease of motor output is carried out by the increase and decrease of the amount of gas fuel, when so forming, in the diesel engine of light oil fuel possessing this exhaust introducing mechanism, also originally stable under idle state burning can be maintained, therefore by the burning of this light oil is used in catching fire of rock gas, thus when with when changing compared with the gas fuel control such with the ratio of light oil fuel according to engine operating status, reliably compression ignition can be carried out to light oil fuel by constant this very simple control of light oil fuel amount, can with the amount of gas fuel independently, gas fuel is burnt well with minimum air inflow combustion efficiency.In addition, the air fuel ratio of waste gas, air excess coefficient lambda, oxygen concentration are measured, carry out theory than judging in the mode becoming Theoretical combustion, and the aperture of the intake-air throttle valve in this situation is controlled.
Thus, exhaust gas temperature can be improved the amount that suction air quantity is few compared with the ratio of fuel quantity, therefore, it is possible to improve the exhaust-gas purifying performance being arranged at the emission-control equipment (after-treatment device) of exhaust passageway.In addition, exhausted air quantity also reduces the few amount of suction air quantity, and therefore the capacity of waste gas cleaning plant is less, can correspondingly miniaturization.
Be configured in above-mentioned natural gas engine, under the operating condition of work of carrying out above-mentioned exhaust introducing mechanism, and control with the air inlet restriction based on the air inlet shutter being arranged at gas handling system path, when so forming, can while this exhaust introducing mechanism work, air inlet shutter is made to carry out throttling towards the work of valve closing direction to air inlet, suction air quantity (amount of new gas) is made to reduce to the amount can carrying out Theoretical combustion, and the pressure of gas handling system passage side can be made to reduce, therefore, it is possible to more efficiently make waste gas reflux in cylinder, internal cylinder temperature can be made to increase further, combustion efficiency can be improved further.
In addition, in the diesel engine making light oil burn of prior art, usually phase is carried out, air inlet shutter (intake-air throttle valve) is not therefore set, but in the present invention, in order to improve the thermal efficiency further, needing to make gas fuel carry out Theoretical combustion or dense burning to carry out throttling to suction air quantity, therefore this air inlet shutter is set.This air inlet shutter is utilized as assist and imports waste gas in cylinder.
In addition, be configured in above-mentioned natural gas engine, under the operating condition of work of carrying out above-mentioned exhaust introducing mechanism, and control with the air inlet restriction based on the air inlet shutter being arranged at gas handling system path, when so forming, when making exhaust throttle carry out throttling towards the work of valve closing direction to exhaust, the pressure of vent systems passage side uprises, the waste gas of vent systems passage side is easily refluxed in cylinder, capacity of reflux can be made to increase, ascending effect in the temperature in cylinder can be improved further.
And, for realizing the method for operation of the natural gas engine of the present invention of above-mentioned purpose be, this natural gas engine is configured to, gas fuel is sprayed towards gas handling system path, by the light oil fuel of ignition source towards in-cylinder injection, spark ignition system is not used when the catching fire of gas fuel, and by the compression ignition being injected into the light oil fuel in cylinder, gas fuel is burnt, and possess the exhaust introducing mechanism importing waste gas in the cylinder in intake stroke, the feature of the method for operation of this natural gas engine is, the amount of the light oil fuel towards in-cylinder injection is set to the light oil fuel amount of idle running in whole operation range of this natural gas engine, the increase and decrease of motor output is carried out by the increase and decrease of the amount of gas fuel.
According to the method, by being vented the work of introducing mechanism, in intake stroke, make the high-temp waste gas of vent systems path suitably reflux in cylinder thus, can after burning is tight, the waste gas of high temperature be imported in cylinder, therefore, it is possible to make the temperature of the mixed gas of light oil fuel, gas fuel, suction air and the waste gas in cylinder rise.Thus, even if also stably compression and combustion can be carried out by a small amount of light oil fuel, stably can also carry out the burning of gas fuel, stable burning can be realized.As a result, combustion efficiency improves, and the amount for the light oil fuel caught fire reduces, therefore by a small amount of light oil fuel, in addition, as a whole, the heat produced due to the burning of fuel tails off, and the heat therefore towards vent systems flow channels reduces, and fire damage reduces and durability improves.
In the diesel engine of light oil fuel possessing this exhaust introducing mechanism, also originally stable under idle state burning can be maintained, therefore by the burning of this light oil is used in catching fire of rock gas, thus when with when changing compared with the gas fuel control such with the ratio of light oil fuel according to engine operating status, reliably compression ignition can be carried out to light oil fuel by constant this very simple control of light oil fuel amount, can with the amount of gas fuel independently, gas fuel is burnt well with minimum air inflow combustion efficiency.In addition, the air fuel ratio of waste gas, air excess coefficient lambda, oxygen concentration are measured, carry out theory than judging in the mode becoming Theoretical combustion, and the aperture of the air inlet shutter (intake-air throttle valve) in this situation is controlled.
Thus, exhaust gas temperature can be improved the amount that suction air quantity is few compared with the ratio of fuel quantity, therefore, it is possible to improve the exhaust-gas purifying performance being arranged at the emission-control equipment (after-treatment device) of exhaust passageway.In addition, exhausted air quantity also reduces the few amount of suction air quantity, and therefore the capacity of waste gas cleaning plant is less, can correspondingly miniaturization.
In addition, in the method for operation of above-mentioned natural gas engine, when under the operating condition of work of carrying out above-mentioned exhaust introducing mechanism, carry out and with based on be arranged at above-mentioned gas handling system path air inlet shutter air inlet restriction control and based on be arranged at vent systems path exhaust throttle exhaust throttle control control time, waste gas can be more efficiently made to reflux in cylinder, internal cylinder temperature can be made to increase further, combustion efficiency can be improved further.
The effect of invention
According to the method for operation of natural gas engine of the present invention and natural gas engine, by being vented the work of introducing mechanism, high-temp waste gas after making burning tight refluxes and is taken in cylinder in intake stroke, therefore, it is possible to make the temperature of the mixed gas of light oil fuel, gas fuel, suction air and the waste gas in cylinder rise, even if also stably compression and combustion can be carried out by a small amount of light oil fuel, stably can also carry out the burning of gas fuel, realize stable burning.As a result, combustion efficiency becomes good, reduces for the light oil fuel amount of catching fire, therefore by a small amount of light oil fuel, in addition, as a whole, the heat produced due to the burning of fuel tails off, and the heat therefore towards vent systems flow channels reduces, and fire damage reduces and durability improves.
Accompanying drawing explanation
Fig. 1 is the figure of the formation of the natural gas engine schematically representing embodiments of the present invention.
Fig. 2 is the figure imported for illustration of exhaust.
Fig. 3 is the figure representing the lifting being vented the suction valve in importing and outlet valve.
Fig. 4 is the figure of the relation represented between the light oil fuel of method of operation of the present invention and gas fuel.
Fig. 5 is the figure be described for normal fire and the combustion regime of the gas fuel of the natural gas engine to prior art.
Fig. 6 is the figure that the detonation (abnormal combustion) of gas fuel for the natural gas engine to prior art is described.
Fig. 7 is for prior art and catching fire and figure that combustion regime is described with the fuel of the natural gas engine of light oil fuel.
Fig. 8 is the figure compared schematically representing the compression pressure of natural gas engine and the compression pressure of common diesel engine.
Embodiment
Below, with reference to accompanying drawing, the natural gas engine of embodiments of the present invention and the method for operation of natural gas engine are described.The natural gas engine 10 of the embodiments of the present invention shown in Fig. 1 and Fig. 2 is, intake manifold (gas handling system path) 11a of engine main body 11 is connected with inlet air pathway (gas handling system path) 12, gas exhaust manifold (vent systems path) 11b is connected with exhaust passageway (vent systems path) 13, and is provided with the EGR passage 14 connecting exhaust passageway 13 and inlet air pathway 12.
In addition, turbo-type supercharger (turbosupercharger) 15 is provided with.The turbo machine 15a of this turbo-type supercharger 15 is arranged at exhaust passageway 13, compressor 15b is arranged at inlet air pathway 12, by the axle 15c that turbo machine 15a and compressor 15b is carried out linking, rotation exhaust energy by waste gas G being carried out the turbo machine 15a rotated is passed to compressor 15b, is compressed suction air A by this compressor 15b.
The inlet air pathway 12 that suction air A passes through is provided with compressor 15b, interstage cooler 16 and air inlet shutter (intake-air throttle valve) 17, suck air A to be compressed by compressor 15b, cooled by interstage cooler 16 and air density rises, carry out flow adjustment by air inlet shutter 17, and import the firing chamber 64 in the cylinder 70 shown in Fig. 2.
In addition, as shown in Figure 1, carry out burning at light oil fuel f and gas fuel C and on exhaust passageway 13 that the waste gas G that produces passes through, the waste gas cleaning plant (after-treatment device) 18 being provided with turbo machine 15a and being made up of DPF (diesel particulate filter) 18c etc. of three-way catalyst 18a, oxidation catalyst 18b, band catalyzer.In addition, between turbo machine 15a and waste gas cleaning plant 18, exhaust throttle 42 is provided with.Further, as required and a part of waste gas G is imported EGR passage 14 as EGR gas Ge, remaining waste gas G is purified by waste gas cleaning plant 18 and towards airborne release after driving turbo machine 15a.
In addition, in the EGR passage 14 that EGR gas Ge passes through, be provided with the cooler for recycled exhaust gas 19 that EGR gas Ge is cooled and the EGR valve 20 that the flow of EGR gas Ge is adjusted, EGR gas Ge is being cooled by cooler for recycled exhaust gas 19 after exhaust passageway 13 branch, and adjusts flow by EGR valve 20 and to inlet air pathway 12 recirculation.
Further, in this natural gas engine 10, being configured in the same manner as diesel engine, possessing the light oil fuel supply pipeline (not shown) for being sprayed in the cylinder 70 of engine main body 11 by light oil fuel f.Thus, identical with common diesel engine, as shown in Figure 2, in cylinder 70, spray light oil fuel f from light oil fuel sparger (light oil fuel injection apparatus) 69.
And, in the present invention, about engine main body 11, fuel injection system, cooling system etc., be configured to the formation possessing common diesel engine, and on the basis that these are formed, as shown in Figure 1, be configured to possess natural gas supply system 30, this natural gas supply system 30 is by natural gas tank (CNG tank) 31, solenoid valve 32, regulator (regulator) 33, chamber 34, be configured at the CNG sparger (gas fuel injection apparatus) 35 of ratio air inlet shutter 17 downstream of inlet air pathway 12, and the CNG pipe arrangement 36 that these connect is formed.
By this natural gas supply system 30, be stored in the gas fuel C of natural gas tank 31 by CNG pipe arrangement 36, after have adjusted pressure via solenoid valve 32 by regulator (regulator) 33, sprayed in gas handling system path 65 (being inlet air pathway 12 in FIG) while control emitted dose and injection timing by CNG sparger 35.
Further, be configured in the present invention, when the catching fire of gas fuel C, do not use spark ignition system, and by the compression ignition of the light oil fuel f being injected into the firing chamber 64 in cylinder 70, gas fuel C is burnt.Meanwhile, be configured to possess the exhaust introducing mechanism (not shown) importing waste gas G in the cylinder 70 in intake stroke.
As this exhaust introducing mechanism, in the exhaust cam that the outlet valve 68 made shown in Fig. 2 works, for making the common cam profile of outlet valve 68 valve opening in common exhaust stroke, adding the exhaust importing cam profile being formed and have the phase angle of roughly 90 °, this exhaust can be made to import cam profile work according to engine operating status.Thus, as shown in FIG. 2 and 3, following formation can be adopted: in intake stroke, make outlet valve 68 promote 1mm ~ 3mm degree and make its valve opening, make thus to be communicated with vent systems path 67 (being exhaust passageway 13 in FIG) in cylinder 70, and import waste gas G in intake stroke.
In addition, be arranged through the exhaust that the o different from outlet valve 68 carry out the work of open and close valve and import valve, give drive singal according to engine operating status to this o.Thus, following formation can also be adopted: in timing as shown in Figure 3, in intake stroke, make exhaust import valve promote and make its valve opening, make thus to be communicated with vent systems path 67 (exhaust passageway 13) in cylinder 70, and import waste gas G in intake stroke.
By the work of this exhaust introducing mechanism, the light oil fuel f in cylinder 70, gas fuel C can be made, suck the temperature rising of the mixed gas of air A and waste gas G, even if therefore also stably compression and combustion can be carried out by a small amount of light oil fuel f, and stably can carry out the burning of gas fuel C, stable burning can be realized.As a result, combustion efficiency becomes good, and the amount for the light oil fuel f caught fire reduces, therefore by a small amount of light oil fuel f.In addition, as a whole, the heat produced due to the burning of fuel f, C tails off, and therefore as a result, the heat flowed towards exhaust passageway 13 reduces, and fire damage reduces and durability improves.
In addition, even if when natural gas engine 10 becomes the starting of low temperature, internal cylinder temperature also can be made promptly to heat up, and therefore startability becomes good.In addition, can be started by a small amount of light oil fuel f when starting.Therefore, by start cause misfire and the discharge capacity of unburned hydrocarbon also significantly reduces.In addition, internal cylinder temperature can be made promptly to heat up, therefore, it is possible to accelerate smoothly.
And, by utilizing the exhaust introducing mechanism making internal cylinder temperature improve, internal cylinder temperature can be maintained the easily ignitable temperature of light oil fuel f thus, and stable catching fire can be measured by less light oil, even if under underload operating condition, also stable burning can be carried out by a small amount of fuel f, C, therefore, it is possible to reduce engine luggine and improve riding comfort (manoeuvring performance).In addition, the exhausted air quantity of light-load state can be reduced.
In addition, be configured in the present invention, at the downstream side of the turbo machine 15a of exhaust passageway 13 configuration λ (excess air factor) sensor 41, the air excess coefficient lambda in waste gas G can be measured, further, exhaust throttle (exhaust shutter) 42 is set at the upstream side of the turbo machine 15a of exhaust passageway 13.
And, be provided with the control gear 51 being referred to as control unit of engine (ECU), consist of, be transfused to from throttle sensor 52, be arranged at the engine rotation speed sensor 53 of engine main body 11, cooling-water temperature sensor (not shown), be arranged at the air inflow sensor (MAF: not shown) of inlet air pathway 12, be arranged at the exhaust gas oxygensensor 41 of exhaust passageway, exhaust gas temperature sensor (not shown), the signal of the various sensors such as NOx sensor (not shown), to light oil fuel sparger 69, CNG sparger 35, the turbo machine 15a of turbo-type supercharger 15, air inlet shutter 17, and EGR valve 20 etc. controls.
In addition, in the formation of Fig. 1, arrange and roundabout bypass 13a is carried out to exhaust passageway 13, on this bypass 13a, configuration is carried with small capacity, the small-sized continuous regenerative DPF18d of the formation of the DPF of oxidation catalyst or the combination of oxidation catalyst device and DPF etc., and on the exhaust passageway 13 of the part walked abreast with bypass 13a, be provided with for the flowing of waste gas G being switched to towards the situation of bypass 13a with not towards the exhaust flow path switching valve 43 of the situation of bypass 13a.This exhaust flow path switching valve 43 is controlled by control gear 51, and under the state of valve opening, waste gas G is by exhaust passageway 13, and under the state of valve closing, waste gas G passes through small-sized DPF18d by bypass 13a.
Then, the method for operation of the natural gas engine of the embodiments of the present invention in above-mentioned natural gas engine 10 is described.The method of operation of this natural gas engine is the method for operation in natural gas engine 10, this natural gas engine 10 is configured to, gas fuel C is sprayed towards inlet air pathway 12, the light oil fuel f of ignition source is sprayed in cylinder 70, spark ignition system is not used when the catching fire of gas fuel C, and by the compression ignition being injected into the light oil fuel f in cylinder 70, gas fuel C is burnt, and possess the exhaust introducing mechanism importing waste gas G in the cylinder 70 in intake stroke, in this method of operation, carry out in the cylinder 70 in intake stroke, importing waste gas G by exhaust introducing mechanism, and promote the control of catching fire of light oil fuel f.
According to the method for operation of this natural gas engine, by being vented the work of introducing mechanism, the light oil fuel f in cylinder 70, gas fuel C can be made, suck the temperature rising of the mixed gas of air A and waste gas G, even if therefore also stably compression and combustion can be carried out by a small amount of light oil fuel f, and stably can carry out the burning of gas fuel C, stable burning can be realized.Result, combustion efficiency becomes good, amount for the light oil fuel f caught fire reduces, therefore by a small amount of light oil fuel f, in addition, as a whole, the heat produced due to the burning of fuel f, C tails off, therefore as a result, the heat flowed towards exhaust passageway 13 reduces, and fire damage reduces and durability improves.
In addition, further as shown in Figure 4, control as follows: in whole operation range of natural gas engine 10, the amount mf of the light oil fuel f sprayed in cylinder 70 is set to the light oil fuel amount mfa of idle running, and is carried out the increase and decrease of motor output by the increase and decrease of the amount of gas fuel C.
According to this method of operation, in the natural gas engine 10 also with light oil fuel f possessing this exhaust introducing mechanism, stable burning can be maintained under idle state, therefore by the burning of this light oil fuel f is used in catching fire of gas fuel C, thus when with when changing compared with the light oil fuel f control such with the ratio of gas fuel C according to engine operating status, very simply can control by light oil fuel amount constant (mf=mfa) is this, make gas fuel C carry out combustion efficiency with minimum suction air quantity and burn well.Therefore, relative to the ratio of the amount of fuel f, C, exhaust gas temperature can be improved, therefore, it is possible to improve the exhaust-gas purifying performance being arranged at the emission-control equipment 18 of exhaust passageway 13.In addition, the air fuel ratio of waste gas G, air excess coefficient lambda, oxygen concentration are measured, carry out theory than judging in the mode becoming Theoretical combustion, and the valve opening of the air inlet shutter 17 in this situation is controlled.
In addition, in the work of exhaust introducing mechanism, when and with based on be arranged at inlet air pathway 12 air inlet shutter 17 air inlet restriction control and based on be arranged at exhaust passageway 13 exhaust throttle 42 exhaust throttle control time, waste gas G can be more efficiently made to reflux in cylinder 70, internal cylinder temperature can be made to increase further, combustion efficiency can be improved further.
According to the natural gas engine 10 of above-mentioned formation and the controlling method of natural gas engine, by being vented the work of introducing mechanism, the light oil fuel f in cylinder 70, gas fuel C can be made, suck the temperature rising of the mixed gas of air A and waste gas G, even if therefore also stably compression and combustion can be carried out by a small amount of light oil fuel f, and stably can carry out the burning of gas fuel C, stable burning can be realized.As a result, combustion efficiency becomes good, and the amount for the light oil fuel f caught fire reduces, therefore by a small amount of light oil fuel f.In addition, as a whole, the heat produced due to the burning of fuel f, C tails off, and therefore as a result, the heat flowed towards exhaust passageway 13 reduces, and fire damage reduces and durability improves.
In addition, even if when natural gas engine 10 becomes the starting of low temperature, internal cylinder temperature also can be made promptly to heat up, and therefore startability becomes good.In addition, can being started by a small amount of light oil fuel f when starting, therefore also significantly reducing by starting the discharge capacity of misfiring and not firing HC caused.In addition, due to internal cylinder temperature can be made promptly to heat up, therefore, it is possible to accelerate smoothly.
And, by utilizing the exhaust introducing mechanism making internal cylinder temperature improve, internal cylinder temperature can be maintained the easily ignitable temperature of light oil fuel f, stable catching fire can be obtained by less light oil fuel amount mf, even if also stably can be burnt by a small amount of light oil fuel f under underload operating condition, therefore, it is possible to reduce engine luggine and improve riding comfort (manoeuvring performance).In addition, the exhausted air quantity of light-load state can be reduced.
In addition, when bypass 13a being set on exhaust passageway 13 and the DPF18d compared with small capacity of light-load state is set, the capacity of the DPF18d being arranged at bypass 13a can be reduced and realize miniaturization, can at higher this small-sized DPF18d of partial configuration of the temperature closer to engine main body 11, being measured by the light oil PM produced that burns in the waste gas G discharged in air can be reduced.In addition, under the high capacity operating condition that delivery temperature is higher, control for not by bypass 13a by the DPF18c of the larger band catalyzer of the capacity of the back segment being arranged at exhaust passageway 13, therefore less the and coal smoke of exhaust resistance is cleaned.
Utilizability in industry
According to the method for operation of natural gas engine of the present invention and natural gas engine, by being vented the work of introducing mechanism, the light oil fuel in cylinder, gas fuel can be made, the temperature of mixed gas of suction air and waste gas rises, even if therefore also stably compression and combustion can be carried out by a small amount of light oil fuel amount, and stably can carry out the burning of gas fuel, stable burning can be realized.As a result, combustion efficiency becomes good, reduces, therefore by a small amount of light oil fuel for the light oil fuel amount of catching fire.In addition, as a whole, the heat produced due to the burning of fuel tails off, and therefore as a result, the heat towards exhaust passageway flowing reduces, and fire damage reduces and durability improves.Thus, the method for operation being equipped on the such more natural gas engine of vehicle and natural gas engine can be utilized as.
The explanation of symbol
10,10X, 10Y: natural gas engine; 11: engine main body; 12: inlet air pathway (gas handling system path); 13: exhaust passageway (vent systems path); 13a: bypass; 14:EGR path; 15: turbo-type supercharger (turbosupercharger); 16: interstage cooler; 17: air inlet shutter (intake-air throttle valve); 18: waste gas cleaning plant (after-treatment device); 18d: small-sized continuous regenerative DPF; 19:EGR cooler; 20:EGR valve; 30: natural gas supply system; 31: natural gas tank (CNG tank); 35:CNG sparger (gas fuel injection apparatus); 41: exhaust gas oxygensensor (excess air factor sensor); 42: exhaust throttle (exhaust shutter); 43: exhaust flow path switching valve; 51: control gear (ECU); 52: throttle sensor; 53: engine rotation speed sensor; 61: cylinder head; 62: spark plug; 65: gas handling system path; 67: vent systems path; 68: outlet valve; 69: light oil fuel sparger (light oil fuel injection apparatus); 70: cylinder; A: suck air; C: gas fuel; F: light oil fuel; G: waste gas; Ge:EGR gas; λ: excess air factor.
Claims (6)
1. a natural gas engine, gas fuel is sprayed towards gas handling system path, by the light oil fuel of ignition source towards in-cylinder injection, spark ignition system is not used when the catching fire of gas fuel, and by the compression ignition being injected into the light oil fuel in cylinder, gas fuel is burnt, it is characterized in that
Be configured to, possess the exhaust introducing mechanism importing waste gas in the cylinder in intake stroke.
2. natural gas engine as claimed in claim 1, is characterized in that,
Be configured to, in whole operation range of motor, the amount of the light oil fuel towards in-cylinder injection be set to the light oil fuel amount of idle running, carried out the increase and decrease of motor output by the increase and decrease of the amount of gas fuel.
3. natural gas engine as claimed in claim 1 or 2, is characterized in that,
Be configured to, under the operating condition of work of carrying out above-mentioned exhaust introducing mechanism, and control with the air inlet restriction based on the air inlet shutter being arranged at above-mentioned gas handling system path.
4. natural gas engine as claimed any one in claims 1 to 3, is characterized in that,
Be configured to, under the operating condition of work of carrying out above-mentioned exhaust introducing mechanism, and control with the exhaust throttle based on the exhaust throttle being arranged at vent systems path.
5. the method for operation of a natural gas engine, this natural gas engine is configured to, gas fuel is sprayed towards gas handling system path, by the light oil fuel of ignition source towards in-cylinder injection, do not use spark ignition system when the catching fire of gas fuel, and by the compression ignition being injected into the light oil fuel in cylinder, gas fuel is burnt, and possess the exhaust introducing mechanism importing waste gas in the cylinder in intake stroke, the feature of the method for operation of this natural gas engine is
In whole operation range of this natural gas engine, the amount of the light oil fuel towards in-cylinder injection is set to the light oil fuel amount of idle running, is carried out the increase and decrease of motor output by the increase and decrease of the amount of gas fuel.
6. the method for operation of natural gas engine as claimed in claim 5, is characterized in that,
Under the operating condition of work of carrying out above-mentioned exhaust introducing mechanism, carry out and with based on be arranged at above-mentioned gas handling system path air inlet shutter air inlet restriction control and based on be arranged at vent systems path exhaust throttle exhaust throttle control control.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012262543A JP6089639B2 (en) | 2012-11-30 | 2012-11-30 | Natural gas engine and method of operating natural gas engine |
| JP2012-262543 | 2012-11-30 | ||
| PCT/JP2013/080278 WO2014084023A1 (en) | 2012-11-30 | 2013-11-08 | Natural gas engine and operation method for natural gas engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104870784A true CN104870784A (en) | 2015-08-26 |
Family
ID=50827669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380061749.0A Pending CN104870784A (en) | 2012-11-30 | 2013-11-08 | Natural gas engine and operation method for natural gas engine |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US9677465B2 (en) |
| EP (1) | EP2927462A4 (en) |
| JP (1) | JP6089639B2 (en) |
| CN (1) | CN104870784A (en) |
| WO (1) | WO2014084023A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114962094A (en) * | 2022-05-09 | 2022-08-30 | 潍柴动力股份有限公司 | Combustion system and control method thereof |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016001792A1 (en) * | 2015-02-26 | 2016-09-01 | Ngk Spark Plug Co., Ltd. | Particle collection system and particle collection device |
| JP2017008900A (en) * | 2015-06-26 | 2017-01-12 | いすゞ自動車株式会社 | Natural gas engine and operational method of natural gas engine |
| JP6634774B2 (en) * | 2015-10-19 | 2020-01-22 | いすゞ自動車株式会社 | Natural gas engine and heat shielding method for natural gas engine |
| KR102316319B1 (en) * | 2019-10-02 | 2021-10-25 | (주)바로건설기술 | Connecting structure of unit bottom plate |
| CN111188690B (en) * | 2020-01-14 | 2022-08-05 | 潍柴动力股份有限公司 | Combustion control method and control system of natural gas engine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3016886A (en) * | 1960-09-01 | 1962-01-16 | Motoren Werke Mannheim Ag | Dual fuel engines |
| US20020040692A1 (en) * | 2000-05-08 | 2002-04-11 | Lapointe Leon A. | Internal combustion engine operable in PCCI mode with early control injection and method of operation |
| EP1260684A2 (en) * | 2001-05-24 | 2002-11-27 | Isuzu Motors Limited | Device for purifying exhaust gas of diesel engines |
| CN1871414A (en) * | 2003-09-30 | 2006-11-29 | 韦斯特波特研究公司 | Method and apparatus for providing for high egr gaseous-fuelled direct injection internal combustion engine |
| CN101078376A (en) * | 2006-12-28 | 2007-11-28 | 刘学文 | Automobile gasoline and alcohols mixed using method, fuel supplying system and controller |
| WO2012144051A1 (en) * | 2011-04-21 | 2012-10-26 | トヨタ自動車株式会社 | Control device and method for internal combustion engine |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1184558B (en) | 1961-08-16 | 1964-12-31 | Motoren Werke Mannheim Ag | Device for controlling a gas engine to be charged by an exhaust gas turbocharger |
| GB8915352D0 (en) * | 1989-07-04 | 1989-08-23 | Ortech Corp | Dual fuel natural gas/diesel 2-stroke engine |
| JPH08158980A (en) | 1994-12-06 | 1996-06-18 | Mitsubishi Motors Corp | Auxiliary fuel ignition type gas engine and operating method thereof |
| US6230683B1 (en) | 1997-08-22 | 2001-05-15 | Cummins Engine Company, Inc. | Premixed charge compression ignition engine with optimal combustion control |
| US6640773B2 (en) | 2000-12-26 | 2003-11-04 | Westport Research Inc. | Method and apparatus for gaseous fuel introduction and controlling combustion in an internal combustion engine |
| JP3959600B2 (en) | 2001-07-18 | 2007-08-15 | 三菱ふそうトラック・バス株式会社 | Exhaust gas purification device for internal combustion engine |
| CA2406267C (en) * | 2002-10-02 | 2013-01-08 | Westport Research Inc. | Exhaust gas recirculation methods and apparatus for reducing nox emissions from internal combustion engines |
| JP4977993B2 (en) | 2005-10-19 | 2012-07-18 | いすゞ自動車株式会社 | Diesel engine exhaust purification system |
| CA2539711C (en) * | 2006-03-31 | 2009-06-09 | Westport Research Inc. | Method and apparatus of fuelling an internal combustion engine with hydrogen and methane |
| US8469009B2 (en) * | 2006-03-31 | 2013-06-25 | Westport Power Inc. | Method and apparatus of fuelling an internal combustion engine with hydrogen and methane |
| JP4599390B2 (en) | 2007-12-14 | 2010-12-15 | 三菱重工業株式会社 | Micro pilot injection gas engine |
| JP5169439B2 (en) * | 2008-04-24 | 2013-03-27 | 株式会社デンソー | Internal combustion engine control device and internal combustion engine control system |
| CN103154474B (en) * | 2010-08-16 | 2016-02-17 | 西港能源有限公司 | The method of the stoichiometric explosive motor of vaporized fuel and operation explosive motor |
| JP2012057471A (en) | 2010-09-03 | 2012-03-22 | Toyota Motor Corp | Fuel control device of internal combustion engine |
| US20120266846A1 (en) * | 2011-04-25 | 2012-10-25 | Michael Kilbourne | Dual fuel diesel engine system |
| JP5729467B2 (en) * | 2011-05-13 | 2015-06-03 | トヨタ自動車株式会社 | Control device and method for internal combustion engine |
| US20120310509A1 (en) * | 2011-05-31 | 2012-12-06 | Maxtrol Corporation and Eco Power Systems, LLC | Dual fuel engine system |
| DE102012002948A1 (en) * | 2012-02-16 | 2013-08-22 | Man Truck & Bus Ag | Method for operating a self-igniting internal combustion engine |
| JP6089640B2 (en) * | 2012-11-30 | 2017-03-08 | いすゞ自動車株式会社 | Natural gas engine and method of operating natural gas engine |
-
2012
- 2012-11-30 JP JP2012262543A patent/JP6089639B2/en not_active Expired - Fee Related
-
2013
- 2013-11-08 WO PCT/JP2013/080278 patent/WO2014084023A1/en active Application Filing
- 2013-11-08 EP EP13858625.0A patent/EP2927462A4/en not_active Withdrawn
- 2013-11-08 US US14/646,963 patent/US9677465B2/en active Active
- 2013-11-08 CN CN201380061749.0A patent/CN104870784A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3016886A (en) * | 1960-09-01 | 1962-01-16 | Motoren Werke Mannheim Ag | Dual fuel engines |
| US20020040692A1 (en) * | 2000-05-08 | 2002-04-11 | Lapointe Leon A. | Internal combustion engine operable in PCCI mode with early control injection and method of operation |
| EP1260684A2 (en) * | 2001-05-24 | 2002-11-27 | Isuzu Motors Limited | Device for purifying exhaust gas of diesel engines |
| CN1871414A (en) * | 2003-09-30 | 2006-11-29 | 韦斯特波特研究公司 | Method and apparatus for providing for high egr gaseous-fuelled direct injection internal combustion engine |
| CN101078376A (en) * | 2006-12-28 | 2007-11-28 | 刘学文 | Automobile gasoline and alcohols mixed using method, fuel supplying system and controller |
| WO2012144051A1 (en) * | 2011-04-21 | 2012-10-26 | トヨタ自動車株式会社 | Control device and method for internal combustion engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114962094A (en) * | 2022-05-09 | 2022-08-30 | 潍柴动力股份有限公司 | Combustion system and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| US20150300247A1 (en) | 2015-10-22 |
| US9677465B2 (en) | 2017-06-13 |
| EP2927462A4 (en) | 2016-08-17 |
| JP2014109198A (en) | 2014-06-12 |
| EP2927462A1 (en) | 2015-10-07 |
| WO2014084023A1 (en) | 2014-06-05 |
| JP6089639B2 (en) | 2017-03-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104822921A (en) | Natural gas engine and operation method for natural gas engine | |
| EP2646663B1 (en) | Lean burn active ignition engine with aftertreatment system and method | |
| US7104048B2 (en) | Low emission diesel particulate filter (DPF) regeneration | |
| CN104870784A (en) | Natural gas engine and operation method for natural gas engine | |
| US20050263139A1 (en) | High-efficiency, low emission gasoline engines for heavy-duty applications | |
| JP4429359B2 (en) | Device for controlling exhaust pressure pulsation in an internal combustion engine | |
| US8381513B2 (en) | Internal combustion engine system | |
| JP6181361B2 (en) | Method for controlling fuel in an internal combustion engine using gasoline direct injection, in particular controlled ignition | |
| CN110691898A (en) | Compression ignition engine | |
| JP6634774B2 (en) | Natural gas engine and heat shielding method for natural gas engine | |
| WO2011101898A1 (en) | Exhaust purification device for an internal combustion engine | |
| JP6451781B2 (en) | Compression ignition engine and control method of compression ignition engine | |
| JP2017008900A (en) | Natural gas engine and operational method of natural gas engine | |
| JP6398543B2 (en) | Natural gas engine and method of operating natural gas engine | |
| JP6589937B2 (en) | Compression ignition engine | |
| JP2018204471A (en) | Compression ignition type engine and control method for compression ignition type engine | |
| CZ308433B6 (en) | Method of reducing nitrogen oxide emissions from internal combustion engines and the equipment for this | |
| JP2013189870A (en) | Exhaust emission control device for internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150826 |
|
| WD01 | Invention patent application deemed withdrawn after publication |